Vibration damping device



Feb. 7, 1933. c. R. PATON VIBRATION DAMPING' DEYICE Filed Nov. 28, 1950 g Es 8a INVENTOR.

ATT

Patented Feb. 7, 1933 CLYDE B. PA'ION,

vid ng on a shaft are encountered impulses will occur in UNITED STATES PATENT OFFICE OF BIRMINGHAM, MICHIGAN, ASSIGNOB '10 158E STUDEBAKER COB- POBATION, OI SOUTH BEND, INDIANA,

A CORPORATION OF NEW JERSEY vnana'rron nmrme nnvroa Application filed November 28, 1980. Serial No. 498,709.

This invention relates to the dampening of torsional shaft vibrations and more articularly to vibrations of this nature wii in internal combustion engines.

During the operation of internal combustion engines, the crank shaft is subject to certain natural periodic vibrations, the characteristics of the vibrations varying according to the design of the shaft to its mounting, and to other influences. At certain critical engine speeds, the explosions or power phase with the natural vibrations of the shaft, resulting in marked torsional vibrations the amplitude of which frequently builds up to dangerous proportions. Usually the design of the crank shaft and associated parts is such that synchro nization of this sort will take place at several critical speeds within the operative speed range of the shaft, and the amplitude of the resulting vibrationsv may reach destructive proportions at more than one such critical speed.

It is an object of the invention to dampen torsional vibrations generated during the operation of rotating shafts.

It is a further object to absorb torsional vibrations set up .in the crank shafts of internal combustion engines.

Another object comprises means for dampening tors onal vibrations occurring in rotating shafts, which means may operate effectively at several critical speeds of rotation.

Another object resides in the absorption of torsional vibrations by mounting on a shaft adapted for rotation, a body mounted to slip relative to the shaft under certain operating conditions in order to absorb or dampen such vibrations.

A more specific object resides in the provision of means mounted on a rotative shaft, and adapted to present different inertia resistances at diflerent critical shaft speeds.

A further specific object consists in proadapted for rotation and subject to cumulative torsional vibrations at different critical speeds, means designed to slip at different critical speeds of rotation inich of screws order to present diflerent inertia resistances at different critical speeds.

Qther objects will be disclosed in the description of a form of the invention illustrated in the drawing.

Referring to the drawing:

Fig. 1 illustrates a section taken along lines 11 of Figia2, and

Fig.2 s ows a front elevation partially in section of one form of the invention, the partial section being indicated by lines 2-2 of Fig. 1.

In the drawing which is to be taken as illustrative only and not as limiting the scope of the invention in any way, there is shown the crank shaft 11 of an internal combustion engine, having a reduced portion 12, preferably the end of the shaft opposite to that on which the fly wheel is mounted. On this-reduced portion is non-rotatably mounted an annular member 13 by means of key 14, member 13 being formed with an integral circular flange 15 at the inner side thereof, and having a removable circular flange 16 of an outer diameter equal to that of flange 15. Flange 16 is fastened to annulus 13 by means 17, and the member 13 is held free from axial movement on the shaft by means of nut 18.

Upon the member 13, and between flanges 15 and-16 are mounted members 19 and 20, having axlally reduced inner portions 21 and 22 respectively, the inner diameters of sections 19 and 20 being approximately equal to the diameter of the annular member 13,

but having suflicient clearance to permit rotation thereon. The members 19 and 20 are yieldably spaced axially from each other by means of coiled springs 23 mounted circumferentially and at intervals in registering recesses in the adjacent sides of the members, the outer faces of the reduced portions 21 and 22 being pressed against rings 24 and 25 of suitable frictional material which frictionally engage the inner faces of flanges 15 and 16 and the outer faces of portions 21 and 22. Member 19 is formed at its outer periphery with an integral able flange 27 fastened thereto by screws 28.

Within the groove formed betweenfianges flange 26 and with a removtherewith but being vibration dampener,

26 and'27 are mounted ring members 29 and 30, having a sliding fit at their inner diameters with member 19, and being axially spaced by means of springs 31 set circumferentially and at intervals in opposed registering pockets in the inner surfaces of members 29 and 30, the springs forcing the ring members into engagement with rings 32 an 33 formed of frictional material, which are a a of anges 26 and 27 members 29 and 30. The members 19 and the outer faces of and 20 form aprimary the springs 23 adapted to press the members into frictional engagement with flanges rotation with the crank shaft, the members being adapted to slip at a certain critical speed of the crankshaft in order to dampen out the objectionable torsional vibrations. Members 29 and 30 form a secondary vibration dampener adapted .to rotate with the crank shaft when the member 19 is rotatin adapted to slip at'a critical speed which is different from that at which the members 19 and slip.

The movement of inertia of members 19 and 20, the strength of springs 23, and the form and coeflicient of friction of rings 24 and are so designed as to cause slippage ata predetermined critical speed, and the recal speed differing sistance of inertia offered is so proportional that the energy generated by the torsional vibrations of the shaft at that speed is effectively absorbed and dissipated. The corresponding characteristics of members 29 and 30, springs 31, and friction rings 32 and 33% are so regulated as to cause a slippage 0 members 29 and 30 at a predetermined critifrom that at which members l9 and 20 slip, and the resistance of inertia of members 29 and 30 is likewise proportioned to effect a proper dampening of the torsional oscillations occurring at its criti cal speed.

From the-above description it will be evident that a satisfactory dampening of unat-a number of critical speeds, and without substantially adding to,the weight of the crank shaft assembly.

ing of vibrations occurring at two critical speeds, it will be'understood that a third vibration dampening assembly may' be mounted on ring 29, designedto slip at .a third critical speed, or additional dampening assemblies may be mounted to take care of said shaft adapted to operate at a predetermined critical speed to absorb torsional viration and a second means mounted upon said first means and therewith and adapted to operate at a differ ted to frictionally engage the inner faces and'16, so as to cause p desirable torsional vibrations may be effected i lonal engagement h smd second Although the inven-' 'tion is described with respect to the dampen-- frictionally associated ent predetermine torsional vibration. Y 2. A vibration dampener for a rotary shaft comprising means adapted to be frictionally rotated by said shaft and to automatically slip in both directions relative to said shaft to absorb a predetermined range of torsional vibration, and a second means mounted upon said first means frictionally associated there- .with adapted to be rotated by said shaft and to automatically slip relative to said shaft to absorb a different predetermined range of torsional vibration.

. 3. A vibration dampener for a rotary shaft critical speed to absorb comprising an inner member adapted to be' rotated by theshaft, a second member adapted to be frictionally rotated by said inner member and to automatically slip relative thereto under predetermined conditions of shaft vibration, and a third member mounted g upon said second member adapted to be frictionally rotated thereby and to slip relative thereto under different predetermined conditions of shaft vibration. A

4. A vibration dampener for a rotary shaft comprising. an inner member adapted to be rotated by the shaft, an intermediate member adapted to be frictionally rotated by said inner member and to slip relative thereto whenever torsional vibrations in said shaftare wlthin predetermined range, and an outer member adapted to be frictionally rotated by said intermediate member and to. slip relative thereto when the torsional vibrations in the shaft are within a different. predetermined range.

5. A vibration dampener for a rotary shaft comprising an inner member mounted on said shaft, a second member having axially separated parts and having a frictional engages ment with said inner member, resilient means for connecting the said parts and for forcing them into frictional engagement with the inner member, and an outer member having a memer. a

. 6. A vibration dampener for a rotary shaft comprising an inner member mounted on said shaft, a second member frictionally mounted on said inner member, a third member having axially separated 'parts which frictionally engage the second member, resilient means for connecting 'saidparts and for forcing them into'f'rictional engagement with the second member. '7. A'vibration dampener for a rotary shaft comprising an inner member non-rotatably r, anouter member having axiallyseparated parts which frictionally engage the inter mediate member, resilient means for connecta no ' mounted on said shaft, an intermediate momf a I l ber frictionally mounted 'on said inner memcomprising meansfrictiona-lly associated with b ing said parts and for forcing them intofrictional engagement with the intermediate member.

8. A vibration dampener for a rotary shaft comprising an inner member non-rotatably mounted on said shaft, a second member angularly movable relative to said shaft having axially separated parts which frictionally engage the inner member, resilient means for connecting said parts and for forcing them into frictional engagement with the inner member, a third member having axially se arated parts which frictionally engage t e second member, said last named parts having resilient means which connect them and which force them into frictional engagement with the second member.

9. A vibration dampener for a rotary shaft comprising an inner member non-rotatably mounted on said shaft, a second member angularly movable relative to said shaft having axially separated arts which frictionally engagethe inner mem er, resilient means for connecting said parts and for forcing them into frictional engagement with the inner member, a third member angularly movable relative to said second member and said shaft mounted on one of the parts of said second. member having axially separated parts which frictionally engage the second member, said last named parts having resilient means which connect them and which force them into frictional engagement with the second member.

Signed by me at Birmingham, Michigan, this 21st day of November, 1930-.

v CLYDE B. PATON. 

